At the start of Keane & Vieira: Best of Enemies (ITV4, Wednesday) the contests between Arsenal and Manchester United are described as “a brilliant, vicious Premier League rivalry that has never been bettered”. At the fast-beating heart of that battle were the two players for almost a decade. They took the odd beating, but here they are reunited in retirement. It made for almost as compulsive viewing as the real thing, rather like watching a psychopath from the other side of the prison bars.